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Fair Values of Financial Instruments - Schedule of Assets by Pricing Source and Fair Value Hierarchy Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale $ 7,611,633 $ 9,068,946
Debt securities, trading: 1,065,993 1,077,438
Equity securities: 22,076 28,217
Derivatives, index options 23,669 101,622
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 0 0
Debt securities, trading: 0 0
Equity securities: 18,407 23,795
Mortgage loans 0 0
Derivatives, index options 0 0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 7,148,837 8,741,984
Debt securities, trading: 942,756 1,002,616
Equity securities: 3,669 4,422
Mortgage loans 0 0
Derivatives, index options 0 0
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 462,796 326,962
Debt securities, trading: 123,237 74,822
Equity securities: 0 0
Mortgage loans 457,873 513,246
Derivatives, index options 23,669 101,622
Total assets 119,006 223,359
Recurring basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 7,611,633 9,068,946
Debt securities, trading: 1,065,993 1,077,438
Equity securities: 22,076 28,217
Mortgage loans 19,334 8,469
Derivatives, index options 23,669 101,622
Short-term Investments: 3,937  
Total assets $ 8,746,642 10,284,692
Percent of total 100.00%  
Recurring basis | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale $ 0 0
Debt securities, trading: 0 0
Equity securities: 18,407 23,795
Mortgage loans 0 0
Derivatives, index options 0 0
Short-term Investments: 0  
Total assets $ 18,407 23,795
Percent of total 0.20%  
Recurring basis | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale $ 7,148,838 8,741,984
Debt securities, trading: 942,756 1,002,616
Equity securities: 3,669 4,422
Mortgage loans 0 0
Derivatives, index options 0 0
Short-term Investments: 3,937  
Total assets $ 8,099,200 9,749,022
Percent of total 92.60%  
Recurring basis | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale $ 462,795 326,962
Debt securities, trading: 123,237 74,822
Equity securities: 0 0
Mortgage loans 19,334 8,469
Derivatives, index options 23,669 101,622
Short-term Investments: 0  
Total assets $ 629,035 $ 511,875
Percent of total 7.20%  
Priced by third-party vendors | Recurring basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale $ 7,535,630  
Debt securities, trading: 1,065,993  
Equity securities: 22,076  
Derivatives, index options 23,669  
Short-term Investments: 3,937  
Priced by third-party vendors | Recurring basis | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 0  
Debt securities, trading: 0  
Equity securities: 18,407  
Derivatives, index options 0  
Short-term Investments: 0  
Priced by third-party vendors | Recurring basis | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 7,148,838  
Debt securities, trading: 942,756  
Equity securities: 3,669  
Derivatives, index options 0  
Short-term Investments: 3,937  
Priced by third-party vendors | Recurring basis | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 386,792  
Debt securities, trading: 123,237  
Equity securities: 0  
Derivatives, index options 23,669  
Short-term Investments: 0  
Priced internally | Recurring basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 76,003  
Equity securities: 0  
Mortgage loans 19,334  
Priced internally | Recurring basis | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 0  
Equity securities: 0  
Mortgage loans 0  
Priced internally | Recurring basis | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 0  
Equity securities: 0  
Mortgage loans 0  
Priced internally | Recurring basis | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities, available-for-sale 76,003  
Equity securities: 0  
Mortgage loans $ 19,334